Ardiansari, Lia. “Pra-Aljabar: Langkah Baru Mengajar Aljabar Awal (Penerapan Didactical Design Research)”. Proximal: Jurnal Penelitian Matematika dan Pendidikan Matematika 1, no. 1 (March 1, 2018): 32–44. Accessed September 10, 2025. https://e-journal.my.id/proximal/article/view/182.